Drop unneeded reference to GPX files.

geostat.cpp

@@ -14,7 +14,7 @@
 
 void show_usage() {
 	std::cout << "Usage: geostat [options]\n";
-	std::cout << "Generate HTML stats from Opencaching data or GPX files.\n\n";
+	std::cout << "Generate HTML stats from Opencaching data.\n\n";
 	std::cout << " * Data sources:\n";
 	std::cout << "\t-o[user]\tuse Opencaching; if specified user will be a user name used for all OC instances\n";
 	std::cout << "\t-p user\t\tuser for opencaching.pl\n";